Table 1.
Characteristics of the study population at baseline according to maternal hypertensive disorders during pregnancy
| Denmark | Sweden | |||
|---|---|---|---|---|
| No | Yes | No | Yes | |
| Sex | ||||
| Boys | 1,026,939 (51.3) | 46,386 (51.9) | 1,183,231 (51.4) | 49,580 (52.3) |
| Girls | 974,436 (48.7) | 42,854 (48.1) | 1,120,405 (48.6) | 45,213 (47.7) |
| Preterm birth (< 37 gestational weeks) | ||||
| No | 1,839,865 (91.9) | 77,381 (86.7) | 2,199,179 (95.5) | 77,495 (81.8) |
| Yes | 84,043 (4.2) | 11,684 (13.1) | 101,826 (4.4) | 17,173 (18.1) |
| Missing | 77,467 (3.9) | 175 (0.2) | 2631 (0.1) | 128 (0.1) |
| Apgar score at 5 min | ||||
| 10 | 1,836,432 (91.8) | 78,005 (87.4) | 1,913,306 (83.0) | 70,164 (74.0) |
| ≤ 9 | 132,835 (6.6) | 10,387 (11.6) | 368,200 (16.0) | 23,603 (24.9) |
| Missing | 32,108 (1.6) | 848 (1.0) | 22,130 (1.0) | 1026 (1.1) |
| Parity | ||||
| 1 | 878,604 (43.9) | 52,237 (58.5) | 969,936 (42.1) | 56,816 (59.9) |
| 2 | 753,614 (37.6) | 24,265 (27.2) | 841,565 (36.5) | 23,021 (24.3) |
| ≥ 3 | 369,157 (18.5) | 12,738 (14.3) | 492,135 (21.4) | 14,956 (15.8) |
| Maternal age (years) | ||||
| ≤ 24 | 421,987 (21.0) | 19,248 (21.6) | 441,908 (19.2) | 18,262 (19.3) |
| 25–29 | 742,193 (37.1) | 31,224 (35.0) | 785,823 (34.1) | 29,802 (31.4) |
| 30–34 | 587,804 (29.4) | 24,475 (27.4) | 711,839 (30.9) | 27,693 (29.2) |
| ≥ 35 | 249,391 (12.5) | 14,293 (16.0) | 364,066 (15.8) | 19,036 (20.1) |
| Maternal education (years) | ||||
| ≤ 9 | 558,202 (27.9) | 25,158 (28.2) | 799,080 (34.7) | 33,214 (35.0) |
| 10–15 | 873,455 (43.6) | 40,410 (45.3) | 1,121,677 (48.7) | 48,668 (51.3) |
| ≥ 15 | 557,226 (26.9) | 22,744 (25.5) | 324,747 (14.1) | 11,440 (12.1) |
| Missing | 32,492 (1.6) | 928 (1.0) | 57,132 (2.5) | 1471 (1.6) |
| Maternal psychiatric disorders | ||||
| No | 1,897,588 (94.8) | 84,006 (94.1) | 2,219,248 (96.3) | 90,934 (95.9) |
| Yes | 103,787 (5.2) | 5234 (5.9) | 84,388 (3.7) | 3859 (4.1) |
| Maternal cohabitation at birth | ||||
| Yes | 1,123,132 (56.1) | 46,211 (51.8) | 1,232,307 (53.5) | 56,301 (59.4) |
| No | 876,533 (43.8) | 43,004 (48.2) | 1,062,179 (46.1) | 38,291 (40.4) |
| Missing | 1710 (0.1) | 25 (< 0.1) | 9150 (0.4) | 201 (0.2) |
| Attention-deficit/hyperactivity disorders | ||||
| Yes | 31,629 (1.6) | 1629 (1.8) | 58,252 (2.5) | 2966 (3.1) |
| No | 1,969,746 (98.4) | 87,611 (98.2) | 2,245,384 (97.5) | 91,827 (96.9) |
| Autism spectrum disorders | ||||
| Yes | 22,536 (1.1) | 1306 (1.5) | 27,654 (1.2) | 1571 (1.7) |
| No | 1,978,838 (98.9) | 87,934 (98.5) | 2,275,982 (98.8) | 93,222 (98.3) |
| Intellectual disability | ||||
| Yes | 10,305 (0.5) | 620 (0.7) | 16,364 (0.7) | 1042 (1.1) |
| No | 1,991,040 (99.5) | 88,620 (99.3) | 2,287,272 (99.3) | 93,751 (98.9) |